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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68291af7caab9811a206d200f8f571f1947180764bba1c014ef58c9623f8492e' 
  AND token = 'vnQfI4pUKJq/3zyS/Z9xfp4ohiW224mfO+7N1+pf510=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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