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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758f7bb1314b4a5716b237879188c19c791ff7351975b43383a326f7657410ef' 
  AND token = 'g6S19TwYGhAH8V2c92YYo2M3rLYdZNakgT51SftdSJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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