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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4df1d3ba44513fc86a7bab34f951f48c127a4a26cee3901726929a58bcfcef0' 
  AND token = 'hHdBFD6UUSInds4UIQJaV3TmVCDnBSaSuxcdD1qJdhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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