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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda59861528f63ae2a85e4fd5b32b2ea5fbf315097acc9edea4099042ac13f10' 
  AND token = 'L/cURyb429L0g0B7W25NoG6CHr196ftO4Gf9gHG9P2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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