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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f2ead49ec3c3e06f93ab0bc49aa9a6db2265c40dcbc21b38c92ccaf550fdd7' 
  AND token = 'hIT5a9IhE337MtekwMuDWMEoNdTA0l1tSNBsR1Hx8Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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