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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815950ef6e11bd615477c6642fb47b1caba14fdf4220a10ffa06b5ca223f13db' 
  AND token = '7BqewCriQJx87b8GIKAwYuxskvI2XnatC2ceaE5pdJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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