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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '134908a6924f2b46965d73d1e609c213334553ad5f9b47036e67fe8d8c384baf' 
  AND token = 'z5M9J0cnqTi+cBJiATBkGVO2wJ12TtZaCrjD7oWNfZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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