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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2b53f739aea3260bad6f652bf243850fe753c69a330d76511d20b7b5e62507' 
  AND token = 'robtXeYPTQye/G2TaFmfKgIwHUTKuVv8Ndcp6vXLWFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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