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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0282023edb22ca3ed71fd256509d4245d261bc7cfe05907fd3ad9d4fe75170c0' 
  AND token = 'SycRcxG6vtSVUvMLg2NrQ4XkOZdKtZS9Xsp7BOWAwO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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