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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fe2ab11ad843ce4aaa508cdceafef9a27aee6b3299c7a1e0e5b87fac011c09c' 
  AND token = 'KC6LSAayEvB7jmymq3rq3C8tMRlZttj2oVFpZ6xlNYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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