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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f824f1b828b494fbe4f6ee746571cd179d6b1926f0737e875e7466d0f26a41aa' 
  AND token = 'uSAK8A0EfoyliDwfnZxtCXP49B8KlMlcP9NitWcLAuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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