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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8a013963f539dfe4b9349e4ceca261556b050bf93a0e26a5ad68b819996844' 
  AND token = 'ntiuM86UzOzdNTZ/NP9OLRaQcCvGQ1IXEV60MEejZwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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