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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36155e8de4f5498e9f7bfb239ca161f57f81ebe4bb740581ae83d8c1f6428da' 
  AND token = 'bnNxpVThrxqaqJTefI9nWOB11eSbkT2L78dWFmPxAms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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