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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594f83ca93d6a7e88b0f7368c30f050beec0af63e476ab3872fb1ca4b4436568' 
  AND token = '7b1ZKfOG/BhLoG6aH5pNjIGqWRmDzikSMAcqxuZMX+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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