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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715ecf8ee90bd61ebaea5db6d406757b7ae28c6a158963c149320e9b881bf85' 
  AND token = '030t2C3fWGZMVsH5tBeo3ngKBLsSsTEJmBTc5ABL/PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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