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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b09a6afbb94630afa91d50a30966ad16b923eeb2815cbcdb8b6b252eee2984' 
  AND token = 't608bMVu3UTMsFWmbKO3FJYpv3RwuOwiEBnJiqnLAiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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