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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80d64de01ffbdb513fc85d05ec7120daf29ff56f75496b882cb21f24dafe246c' 
  AND token = 'A+UqnETgSDTEpPsirSBTQDgrPl6+mA6ALiVu2wJu3tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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