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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e6ecf827a2249267375d4566898cc3736ba1bb86762969141bc51101d1ebcc' 
  AND token = 'kvLhuRide1p7YfuRV5h2z86R7iHZmZ5MdRy2fZm6hC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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