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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb31bc5217c0bf16bef8826b5b7d675d3fd3431a6e2bb7bfc525a6c2da3693e' 
  AND token = 'C2egEDTTD8Ku7/zcNyiB5K3S1IlPuuEwnKYKOA4evT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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