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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf69b30b266f1b44ffb20d477f79a4333c7e523f56527c58fe4e72668612a4d' 
  AND token = 'r4xAsIef2W6ykipgtSqX/V9M2zI60JRISkrOeI5Vvgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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