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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d650bea1b351a088709ebb95ecf8f83dad72f12844b2b4b2aa5e39d2f33ccdb' 
  AND token = 'lNZqwO/skRqG6gWecfYeTI3dtw+Jp6AonfewoZtslyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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