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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af594616f79dc50d585d532a5861a03239bb30dde6d4212b6a32edd2371f35c' 
  AND token = '89fn6L2AHwMOy7nO8576eVTzQS3+e3YS+60xa4Waa00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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