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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14031c900a57c5d7db83cb9b8a0926be9e0c93b13d4bf567f0f65d5538606adf' 
  AND token = 'qZ7bmcA4cI1+/mHz4R2kAEeytxB5rZ3m05txQnHhkio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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