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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faed56c2cefd3696ddbaa2bf328a8551bcdba697a2b9ce364c85fb3c5db9fde0' 
  AND token = 'Ayy0Fwbdvqb2MF88XY5+0017MuUg1Y0hpa2yoQXb77E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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