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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12d8c3fabf89ccdd997fdc9862ab52fa96c2f21f8b0a44957b81ee4bcaff47e' 
  AND token = '/rYTwD+Ai6KHCBbQBd6qiIXer+Y++Ja+ROArx6uhcd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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