SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ab166f86be601b76633e8bd8692b7e2cadfd51b292643c1e705d6e7a2e1154' 
  AND token = 'nTrHjtqi3VXUqd/vpiZPThSmWKsYoQezmecIVP+KHg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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