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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41096da55d4819d85c0e619829dfb9f621b1605e07a84114a488772418fed8f' 
  AND token = '3G85wa+a+4aKywoZrgBX+b/5JLD7GgkoCzI+78vyidI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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