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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1837f186cb2dae7ba57c1ca5c4d9106b58d6f86bc5e6335b42fab1de1fe92b8a' 
  AND token = 'a65W4xXHQ00v/EaHIPt+Cekoq8nIWYAGOWEL9W8CL7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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