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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eddc9455e925da5ff4a7173b358a8416cdedf15af9de313975f45d4fa760b3' 
  AND token = 'z3LAOOvpcE2L21eYL4lUsp3B1hWpGJPFv6xP5OrHnXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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