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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de038c5b2fac9a1ea0df555e8c2125d74cd718f6155e097c4b99c82f79d08b4' 
  AND token = 'jbjEQurdmeeUYUHapuxzXwBS0FeFHGy0gZ7GIjFKyGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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