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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b5073806c323b47588372c92159547a6872c02997ec92c20b5c2d8b9e4fb31' 
  AND token = '0zOArNeoiSDIhqU01FyxeT9U9YHSzXovEOUGDrpqPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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