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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90ae49b533ba2958bd39ee2bd1b8bbc2b131f837e923d0557ea3c856ae3adc3' 
  AND token = 'g/royHru2NxXX7mBqMSME94iy19pQH1Q/ePXevhpfK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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