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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53880bca8d9dd83a5b69ffa75fe376107c873fafb8288f057f014152f9852e79' 
  AND token = 'RDBnwnu5lv9jlCu97KiiUP7c4SozMuaTVX1tqFyP90A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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