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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f962f5c84889edb863602628213160e058bdc194af5c0f62731255b23a0da02' 
  AND token = 'MKpi/WdSB3jMu8DQWa8gdkzxiPivDgD1yGMfWx890xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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