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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f03f03cd1b13de69ee019e9c7a1ffb97d92bc02afa437d8fa7aa09f7f7518a' 
  AND token = 'pP6HTUPY40pmrc77+kKmWYtwzgvaPZ7icjc5+u0wmsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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