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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb10aa50413f263e43b699c018b67e1fab5bfbd0a3782613fce9a4c7a5a9652e' 
  AND token = 'vaw4Wb44IDQTYJqWL0Ic5ISYFLa4wggs9KDhe4fi4RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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