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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763b97f739977842620e85fbcff13099c6e431310ac842dd55472c9566466438' 
  AND token = 'vJjCE+Y8HArOxghc0U7ozrx0k+0WAS4nxSHsz+Ba3gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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