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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91954caca0afc8aa42a72ece53dd5610086728b50499e78a70a92cb67e90101f' 
  AND token = '2TBlADytH/QQ2ROsb0Rd0iyaFIrQc7jcd8wHFnQgi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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