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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24b22ab39da5c168b62ac7f191e40faf797a3ef69e1957b623cdbccb7800db78' 
  AND token = 'Nhky+vPcU43o1hlWfBDLVOUg3jPAU4jYDbOQfO8fUy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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