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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712493449d064b3c82e9eea8f72c7ed202cb5be82625dde07194edfc9dc7c490' 
  AND token = 'GOgh0AE+8c02HO90auRp2rw4w9vd4Y+0aDHpV6kqtfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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