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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4092bae0537e32c7878e5b8ae1318c707d340cb0c299bf7f6aa1c055a7160b6' 
  AND token = 'gwZ93W7k+s/KyJWmyJ3XhOq5UCOugElVfQmO8N4h8h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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