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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2de1b037cfc4c0d8663d71e42a596e93d185099402e83339a1bc20ef30ae2e' 
  AND token = 'cHZO8hKFP7LrJE0AQhiUoE33lX+pC5eCLyqXS7PGWlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}