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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400098ee09791077f4033f6ef0f9cee49f69c41e44e07f3c7cdc8177ca470daf' 
  AND token = 'KtDHA5PYIRjLEe3rgqEuLBK0aoHF0atE6v2GRTrxp2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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