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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b93a049f7d3081d65e5217f6f69eebefe3c50641795f1b9ddbd11a162b84de7' 
  AND token = 'K2TsKOSCHhvPOL0dki5fpsMOIAhBSulbDarF0L+q0oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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