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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934f22d03920f7c61629983b05a837162c87ef01c8ff6f3464fafbec598069c1' 
  AND token = 'v/mL93gh0T8I3ewuT9CuyhAxuW0i3DfFR1XFfRrkPNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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