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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6c02a4d64c345bc7755fda206f2e70dcf11e5611041f9c577880eb0e550ec3' 
  AND token = 'xjEP7sFyMMiK5N4JbqyNy63CKHWWvEgRT0tWlHl7PDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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