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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8677dd6dfe2762241394748a309d536ce1747b835e67011500c62ea392a21c13' 
  AND token = 'HB+NDwUZkt1/vxyILYZQRVReaayC/H6W/Z75noFBrv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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