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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9363ea6207315053c90bf64ac7209cba0a2a4a344548ea5932072a27ec6f6959' 
  AND token = 'gJyD/6ShDsyX/GirSm0vUC7vq25Tozp9ifliH+mTDv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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