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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a258eb5f06a9c586cd610abc5dd9415a37ee8492f489014b71f600de47a8b4cd' 
  AND token = '2XJgRvcQkDeayZ7B+f4ammAM4nmzxd5RlLAp+X0U6CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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