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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5987444257bf731746eeaa8b395c0fcc3f9c1b4adb92332de5c50976841b2185' 
  AND token = 'hMmGOO1HtiJm6aY2IY6dGKpZDssTvud4uHGyc9i/Hx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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