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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff562648e9b03135f7b704b0d182f32cd3f21dc77ee163018a0fad9c3aa4a17' 
  AND token = 'jk83hC1YgAvSyMIz3GdeLT44oPCKxsWPQGONtZX7t88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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