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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7a8f259eb8c438063e0a7f9024757d9ebd58808b9f75e2687eae34842ec793' 
  AND token = 'f5DTbxPJ7Atf7nUwI2gkf7fqVDb0DoKLiMAmYvZ20+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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