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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53d81613a3864993d0aa7f8a9a62ace011cf9faaf2b09225c68ba6cc50ad4ea7' 
  AND token = '8MiLjYwGLzJQsGU3LgJEia9eW0piSWNsDc37FyQ76jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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