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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddda1a7f625c02801fd5d676c8b28dd2de0b2ee2ba9512f7d9805078b5ca3e00' 
  AND token = 'lqvL3dfEkeQ9p43UEDY/cf9+T6zC8ip9B8BIH0SXm6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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