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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25df896f6e8d337b3969a46e297f480b6ccf882aeedb81ec0c3cf36558340ff' 
  AND token = 'm7818pgDxXEo/D4G/IY6Z14I+zAggRy0j1Kv5STiX9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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