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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0650b3ec1ee3dc49028d9f1ddd05218a51b7a74fc67abc80f38b7381ce3c8bd1' 
  AND token = 'QT2YxfYQpqUYqCTAE77tz0Q3Rzqed3gIy6/lLtpmRbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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