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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544f129c2f6e705a87a3203700f6bd9e6b602d5c9193ffab421ba9e3c68349bd' 
  AND token = 'zLHVY78Rqq6g0Le6gxWVk6ZWPArjy3Q7Ms2Izeqt/6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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