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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1aec4e30ad9906153cf9222ccadd8b90e2c66c42901de53b185ae6bc78981c' 
  AND token = 'VWVRLsOaCoRrUfQAc+uLcK6pi3b6f6m4zJX2lhnkSdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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