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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d151a92e8089c4b112a04ba5e9a2c1c71de76bcaae278d7addfa2068e722261' 
  AND token = 'rnCGmQQUoXmlF4XjnomYwvhtF5jSuPfc4RBVmQihXmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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