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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b2b38526edda09e7fc0a34b317f759db6c4bdcb550131596f588d45a31fa1c' 
  AND token = 'au2+GshW8LIp18V2GKA2vk2pRQW8f2AeTYR6XOYq0ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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